Rollups decouple execution from data availability and ordering. Sequencer fees and DA costs usually dominate recurring spend once you have steady traffic.
What to model first
- Expected transactions per second (sustained, not peak hype).
- Blob / calldata bytes per transaction after compression.
- Your DA layer price curve (fixed tiers vs metered).
Takeaway
Small changes in average tx size or DA pricing move monthly estimates more than micro-optimizing RPC latency—simulate both together before you commit to a stack.